# Experimental study for leptonic and semileptonic decays in the charm sector

## TL;DR

This paper presents experimental measurements of leptonic and semileptonic charm decays, testing flavor universality and exploring rare decays using data from BESIII, LHCb, and B factories.

## Contribution

It provides the most precise measurements to date of charm decays and tests lepton flavor universality with large datasets from multiple experiments.

## Key findings

- Precision measurements of charm meson and baryon decays.
- Tests confirming or challenging lepton flavor universality.
- Improved sensitivity to rare charm decay processes.

## Abstract

Leptonic and semileptonic decays in the charm sector have been well studied in recent years. With the largest data sample near $D\bar D$ threshold, precision measurements of leptonic and semileptonic decays of charm meson and baryon are perfromed at BESIII. Test for letpon flavor universality is also performed. Sensitivity for rare leptonic and semileptonic charm decays is significantly improved taking advantage of the huge statistics in LHCb and the $B$ factories.